If you are asking this question, you probably should not be doing this one. There are a lot of zoning issues with this. There are a lot of "what if..." questions. I would assume that if this is residential zone, there is a condition use or special use permit in effect for the current use. If it commercial or no zoning, then you probably should be a commercial appraiser doing this. If this is residential use, there is a way to do the appraisal "subject to making the property legal residential" (but you need to know what thsi is !!) which may entail removing the superfluous stoves and othewr modifications. Another thing you need to watch for is mortgage fraud - you don't want to get caught up in this. I can see someone trying to get a residential loan for commercial use vs a commercial loan for the property. If I were you and if you are determined to do this one, I would bid $5k and then hire someone to help me if the bid is selected and use this as a learning experience.